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AT85C51SND3Bx

7632A–MP3–03/06

Display Interface The AT85C51SND3Bx implement a display interface allowing glueless direct interfacing

(thanks to its highly configurable capability) to almost all of the LCD controllers found in

either graphic or text LCD display.

These LCD controllers interface is from either 6800 or 8080 compatible type with some

variant in the implementation.

The display interfaces to the C51 core through the following special function registers:

LCDCON0, LCDCON1, the LCD control registers (see Table 255 and Table 256); LCD-

STA, the LCD status register (see Table 257); LCDBUM, the LCD busy mask register

(see Table 258); and LCDDAT, the LCD data register (see Table 259).

As shown in Figure 126, the Display Interface is divided in two major blocks: the Access

Cycle Generator which generates read or write cycles to the LCD controller, and the

Busy Check Processor which enables automatic busy checking after any read or write

cycles.

Figure 126. Display Interface Block Diagram

Configuration

Interface Enable Setting LCEN bit in LCDCON1 enables the display interface. When this bit is cleared, all

signals to the controller are switch back to I/O port alternate function. Thus after reset,

all signals are set to high level.

Interface Selection The display interface is programmed in 6800 type or 8080 type by setting or clearing the

LCIFS bit LCDCON0.

Table 254 shows the pin configuration depending on the interface

selected.

Table 254. Pin Configuration vs. LCD Controller Interface Type (6800/8080)

SLW1:0

LCDCON1.7:6

LCRS

LCDCON1.0

LCRD

LCDCON1.1

RSCMD

LCDCON1.5

LCEN

LCDCON1.2

BU7:0

LCDBUM

BUINV

LCDCON0.7

Busy Check

Processor

OSC

CLOCK

LWR/LRW

LRD/LDE

LA0/LRS

LCS

LD7:0

LCYCW

LCDCON1.4

ADSUH1:0

LCDCON0.5:4

LCBUSY

LCDCSTA

ACCW3:0

LCDCON0.3:0

Access Cycle

Generator

LCIFS

LCDCON0.6

LCYCT

LCDCON1.3

Pin Name 8080 Type Controller 6800 Type Controller

LWR/LRW WR RW

LRD/LDE RD E

LA0/LRS A0 RS

LCS CS CS

LD7:0 D7:0 D7:0

1 2 ... 228 229 230 231 232 233 234 235 236 237 238 ... 262 263

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